document that signifies what is expected to and it has perhaps not been changed. AKA authentic document.
Documents which in fact is really what it states it's or perhaps is represented become, and it is free from any inclusion, deletion, or corruption. Also known as authentic document.
Of the church in Ostia there is no authentic record before the 4th century A.D., though there are several Christian inscriptions of an earlier date; but the first bishop of Ostia of whom we have any certain knowledge dates from A.D.